Override project groovyVersion from env CI_GROOVY_VERSION (#1780)

* Update build.gradle

Override project groovyVersion from env CI_GROOVY_VERSION

* Force groovy version from the env CI_GROOVY_VERSION

Author: puneetbehl

build.gradle

@@ -37,7 +37,11 @@ apply plugin: 'idea'
 apply plugin: 'project-report'
 
 allprojects {
+
+    ext.groovyVersion = System.getenv('CI_GROOVY_VERSION') ?: project.groovyVersion
+
     repositories {
+        mavenLocal()
         mavenCentral()
         maven { url = 'https://repo.grails.org/grails/core' }
         if(isSnapshot) {
@@ -66,6 +70,7 @@ allprojects {
 apply from: "gradle/idea.gradle"
 
 subprojects {
+
     configurations {
         documentation
     }